Includes detailed bidding data for the auction listing that was specified in the request. Unless the listing is private, the actual eBay user IDs of all bidders are returned if the listing's seller makes this API call. If a bidder makes this API call, only that bidder's eBay user ID is returned, and the rest of the bidder's user IDs are anonymized.
The eBay user ID for the user with the winning bid (if auction has ended) or current highest bid (if auction is still active). The seller should take note of or save this User ID as this user may be a a Second Chance Offer candidate.
See the Field Index to learn which calls use HighBidder.